Which of the following is a word borrowed from the Spanish language and used in the English language?
1. El poncho
2. El sándwich
3. El champú
4. El zíper

So we have four words, that are all Spanish words.
We need to pick the word that is BORROWED FROM SPANISH,
and used in English.
This is a little tricky, but I can tell you that it's not "sándwich."
"Sándwich" is a word that is borrowed from English. Not Spanish.